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acpi: Add function to simplify If (CondRefOf (..)) sequences

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The new function is called acpigen_write_if_cond_refof(), and it must
be paired with a following acpigen_write_if_end() call.

Change-Id: I6e192a569f550ecb77ad264275d52f219eacaca1
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56003
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
This commit is contained in:
Tim Wawrzynczak
2021-07-01 11:18:50 -06:00
committed by Patrick Georgi
parent f16a5ec871
commit c4ca2f6396
2 changed files with 17 additions and 0 deletions
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15
src/acpi/acpigen.c
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@@ -1501,6 +1501,21 @@ void acpigen_write_if_lequal_namestr_int(const char *namestr, uint64_t val)
acpigen_write_integer(val);
}
/*
* Generates ACPI code to check at runtime if an object named `namestring`
* exists, and leaves the If scope open to continue execute code when this
* is true. NOTE: Requires matching acpigen_write_if_end().
*
* If (CondRefOf (NAME))
*/
void acpigen_write_if_cond_ref_of(const char *namestring)
{
acpigen_write_if();
acpigen_emit_ext_op(COND_REFOF_OP);
acpigen_emit_namestring(namestring);
acpigen_emit_byte(ZERO_OP); /* ignore COND_REFOF_OP destination */
}
/* Closes previously opened if statement and generates ACPI code for else statement. */
void acpigen_write_else(void)
{

2
src/include/acpi/acpigen.h
View File

@@ -415,6 +415,8 @@ inline void acpigen_write_if_end(void)
{
acpigen_pop_len();
}
/* Emits If (CondRefOf(NAME)) */
void acpigen_write_if_cond_ref_of(const char *namestring);
void acpigen_write_else(void);
void acpigen_write_shiftleft_op_int(uint8_t src_result, uint64_t count);
void acpigen_write_to_buffer(uint8_t src, uint8_t dst);